Infrared surveillance device
First Claim
1. A thermographic scanner of a field of view of a scene observed by an infrared thermographic system, said scanner comprising:
- a first optomechanical means including (a) at least one infrared detector located in a plane, (b) an entrance objective means, having an optical axis, for focusing infrared radiation on said plane of at least one infrared detector, (c) rapid scan means for providing rapid line scanning, and (d) raster scanning element means in a first mode of operation for incrementally adjusting successive scan lines in a direction perpendicular to said scan lines;
a second optomechanical means including (a) means for changing direction of infrared radiation from said scene to said optical axis of said entrance objective, (b) derotator means, and (c) means for rotating said changing means about said optical axis at a first speed, for rotating said derotator means at a second speed equal to one-half said first speed, and for orienting said derotator means at a first initial predetermined angle with respect to said changing means in a first mode of operation, and for orienting said derotator means at a second initial predetermined angle with respect to said changing means in a second mode of operation such that scan lines in said second mode of operation are orthogonally arranged with respect to scan lines during said first mode of operation, independent of said changing means position.
2 Assignments
0 Petitions
Accused Products
Abstract
An infrared thermographic optical scanner is comprised of a first optomechanical device fitted with an entrance objective, at least a raster scan element, and a plane of infrared detectors on which the infrared radiation is focused in the form of lines. Further, there is provided a second optomechanical device made up of an orientable tilted periscope-head mirror and a derotator. The derotator is maintained clamped with respect to the head mirror coupling means for operation in the panoramic mode in a predetermined first angular position such that all lines scanned are parallel to each other, the raster scanning movement being obtained by maintaining the position of the raster element fixed, and by simultaneously causing the rotation of the head mirror, and at half-speed, causing the rotation of the derotator.
24 Citations
9 Claims
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1. A thermographic scanner of a field of view of a scene observed by an infrared thermographic system, said scanner comprising:
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a first optomechanical means including (a) at least one infrared detector located in a plane, (b) an entrance objective means, having an optical axis, for focusing infrared radiation on said plane of at least one infrared detector, (c) rapid scan means for providing rapid line scanning, and (d) raster scanning element means in a first mode of operation for incrementally adjusting successive scan lines in a direction perpendicular to said scan lines; a second optomechanical means including (a) means for changing direction of infrared radiation from said scene to said optical axis of said entrance objective, (b) derotator means, and (c) means for rotating said changing means about said optical axis at a first speed, for rotating said derotator means at a second speed equal to one-half said first speed, and for orienting said derotator means at a first initial predetermined angle with respect to said changing means in a first mode of operation, and for orienting said derotator means at a second initial predetermined angle with respect to said changing means in a second mode of operation such that scan lines in said second mode of operation are orthogonally arranged with respect to scan lines during said first mode of operation, independent of said changing means position. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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Specification